This reverts commit 25b2cb49.

Reason for revert: Used copy of dirmd in third_party/ instead,
making this unnecessary.

Original change's description:
> [recipe_modules/depot_tools] Add dirmd_path to api
>
> This is required to parse DIR_METADATA files.
>
> Bug: 1135347
> Change-Id: I620656d4dbec5e918bfc0f535397869c869446b8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2644827
> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@google.com>

TBR=tandrii@google.com,hnakashima@chromium.org,infra-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1135347
Change-Id: I8ea8dfe8f3587177493fb37a4a37eb24266240e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2686631Reviewed-by: Andrii Shyshkalov <tandrii@google.com>
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>